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Method and system for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation

A technology for desulfurization, denitrification, mercury removal, and catalytic oxidation, which is applied in the field of air pollution control, can solve problems such as affecting economy, high energy consumption, and large consumption, and achieve the effects of avoiding preparation, reducing operating costs, and improving economy and safety.

Active Publication Date: 2012-07-04
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to consume a large amount of external strong oxidant, and the preparation process of strong oxidant consumes a lot of energy, which affects its economy.

Method used

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  • Method and system for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation
  • Method and system for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: Mn-Ce / TiO 2 Catalytic oxidation combined with calcium carbonate absorption for simultaneous desulfurization, denitrification and mercury removal

[0049] The catalyst loaded in the catalytic reactor is Mn-Ce / TiO prepared by precipitation deposition method 2 Catalyst, wherein the molar ratio of Mn / Ti is 0.3, and the molar ratio of Ce / Ti is 0.05. After the flue gas to be treated is dedusted by the dust collector, SO 2 Concentration is 450 ppm, NO concentration is 200 ppm, O 2 Content is 4.5%, Hg 0 The concentration is 0.10 mg / Nm 3 , the concentration of HCl is 20 ppm, the reaction temperature is 130°C, and the reaction space velocity is about 20000 h -1 . When the flue gas passes through the catalyst bed of the catalytic reactor, NO and Hg 0 with O 2 The speed of the catalytic oxidation reaction between NO and Hg 0 are oxidized to NO 2 and Hg 2+ Among them, the oxidation efficiency of nitrogen oxides reaches over 70%, the oxidation efficienc...

Embodiment 2

[0050] Example 2: Pt / TiO 2 Catalytic Oxidation Combined with Calcium Hydroxide Absorption Simultaneous Desulfurization, Denitrification and Demercury

[0051] The catalyst loaded in the catalytic reactor is Pt / TiO prepared by impregnation method 2 Catalyst, wherein the Pt / Ti molar ratio is 0.05. After the flue gas to be treated is dedusted by the dust collector, SO 2 Concentration is 600 ppm, NO concentration is 250 ppm, O 2 Content is 4%, Hg 0 The concentration is 0.08 mg / Nm 3 , the HCl concentration is 10 ppm, the reaction temperature is 150°C, and the space velocity is about 15000 h -1 . When the flue gas passes through the catalyst bed of the catalytic reactor, NO and Hg 0 with O 2 The speed of the catalytic oxidation reaction between NO and Hg 0 are oxidized to NO 2 and Hg 2+ Among them, the oxidation efficiency of nitrogen oxides is about 75%, the oxidation efficiency of mercury is 90%, and the oxidation rate of sulfur dioxide is less than 1%. After tha...

Embodiment 3

[0052] Embodiment 3: Mn-W / TiO 2 Catalytic oxidation combined with calcium carbonate absorption for simultaneous desulfurization, denitrification and mercury removal

[0053] The catalyst loaded in the catalytic reactor is prepared by hydrothermal method Mn-W / TiO 2 A catalyst wherein the Mn / Ti molar ratio is 0.2 and the W / Ti molar ratio is 0.02. After the flue gas to be treated is dedusted by the dust collector, SO 2 Concentration is 550 ppm, NO concentration is 180 ppm, O 2 Content is 5.5%, Hg 0 The concentration is 0.08 mg / Nm 3 , the concentration of HCl is 20 ppm, the reaction temperature is 140°C, and the space velocity is about 10000 h -1 . When the flue gas passes through the catalyst bed of the catalytic reactor, NO and Hg 0 with O 2 The speed of the catalytic oxidation reaction between NO and Hg 0 are oxidized to NO 2 and Hg 2+ Among them, the oxidation efficiency of nitrogen oxides reaches more than 80%, the oxidation efficiency of mercury reaches 98%,...

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Abstract

The invention discloses a method for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation. The method is characterized by comprising the following steps of: (1) arranging a catalytic reactor in a dust-removed smoke duct, wherein a catalyst for promoting oxidizing reaction of NO and HgO is filled in the catalytic reactor; (2) allowing the dust-removed smoke to pass through the catalytic reactor, wherein under catalysis of the catalyst, the reaction speed of the NO, the HgO and O2 is increased and the NO and the HgO are oxidized into NO2 and Hg<2+>; and (3) introducing the smoke subjected to catalytic oxidation into an absorber with an absorption solution, wherein the absorption solution is used for absorbing NO2, Hg<2+> and SO2 from the smoke. The invention also discloses a system applicable to the method. According to the method and the system, the sulfur, the niter and the mercury are removed from the smoke; external oxidant is not required to be added; preparation, transportation and storage of strong oxidant are avoided; operating cost is reduced; and economy and safety of the system are improved.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a method and system for simultaneous desulfurization, denitrification and mercury removal of flue gas based on catalytic oxidation. Background technique [0002] Sulfur dioxide, nitrogen oxides and mercury are the main pollutants released in the process of coal combustion, which have caused serious harm to the atmospheric environment. my country has also formulated increasingly strict emission standards for this. [0003] At present, the most mature and widely used flue gas desulfurization technology is wet desulfurization technology (WFGD), which has high desulfurization efficiency and stable operation, but consumes a lot of water and has high investment and operating costs. The most widely used technology in flue gas denitrification is selective catalytic reduction (SCR), which has the advantages of high denitrification efficiency and stable operation, but the inv...

Claims

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Application Information

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IPC IPC(8): B01D53/64B01D53/60B01D53/75
Inventor 李丽唐念盘思伟韦正乐赵宁
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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